attributeweightcelleditor.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as 
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version. 
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 */
package edu.udo.cs.yale.gui;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** Editor for attribute weights. A text field for numeric values and three buttons. The first button sets the 
 *  weight to zero, the second button to 1, and the third resets the value to the old weight. */
public class AttributeWeightCellEditor extends AbstractCellEditor implements PropertyCellEditor {

    private JPanel panel = new JPanel();
    private JTextField textField = new JTextField(12);
    private GridBagLayout gridBagLayout = new GridBagLayout();
    private double oldValue;

    public AttributeWeightCellEditor(double oldValue) {
	super();
	this.oldValue = oldValue;
	panel.setLayout(gridBagLayout); 
	panel.setToolTipText("The weight for this attribute.");
	textField.setToolTipText("The weight for this attribute.");

	GridBagConstraints c = new GridBagConstraints();
	c.fill = c.BOTH;
	c.weightx = 1;
	gridBagLayout.setConstraints(textField, c);
	panel.add(textField);
	c.weightx = 0;
	addButton(createValueButton("Zero", "0.0"), 1);
	addButton(createValueButton("One", "1.0"), GridBagConstraints.RELATIVE);
	addButton(createValueButton("Reset", oldValue+""), GridBagConstraints.REMAINDER);
    }

    protected JButton createValueButton(String name, final String newValue) {
	JButton button = new JButton(name);
	button.setMargin(new Insets(0,0,0,0));
	button.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent e) {
		    textField.setText(newValue);
		    fireEditingStopped();
		}
	    });
	button.setToolTipText("Sets the weight of this attribute to " + newValue + ".");
	return button;
    }

    protected void addButton(JButton button, int gridwidth) {
	GridBagConstraints c = new GridBagConstraints();
	c.gridwidth = gridwidth;
	c.weightx   = 0;
	c.fill      = c.BOTH;
	gridBagLayout.setConstraints(button, c);
	panel.add(button);
    }

    public Object getCellEditorValue() {
	return (textField.getText().trim().length() == 0) ? null : textField.getText().trim();
    }

    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int col) {
	textField.setText((value == null) ? "" : value.toString());
	return panel;
    }

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
	return getTableCellEditorComponent(table, value, isSelected, row, column);
    }

    public boolean useEditorAsRenderer() {
	return true;
    }
}